I wanted to buy a yellow sapphire stone so I just sent an enquiry to gempundit. I must say they are really very fast. They called me with in couple of hours and help me to find out better stone. Customer support team was very helpful as they provide me images of stone first.
Finally I bought 7.5 ratti yellow sapphire of premium quality from them but I got my gemstone one day late as they promised that I will receive my stone with in 3 days but it took 4 days.